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# Adapted from this: https://github.com/NixOS/nixpkgs/blob/1814b56453c91192f6d5a6276079948f9fe96c18/pkgs/top-level/by-name-overlay.nix
{baseDirectory}: let
# Taken straight out of the `nixpkgs/lib/lists.nix` file.
# We can't depended on `pkgs` (and thus on `lib`), because the `pkgs` module argument
# is only defined in modules we import.
flatten = x:
if builtins.isList x
then builtins.concatMap flatten x
else [x];
# Same thing as flatten.
warn =
# Since Nix 2.23, https://github.com/NixOS/nix/pull/10592
builtins.warn
or (
# Do not eta reduce v, so that we have the same strictness as `builtins.warn`.
msg: v:
# `builtins.warn` requires a string message, so we enforce that in our implementation, so that callers aren't accidentally incompatible with newer Nix versions.
assert builtins.isString msg;
builtins.trace "[1;35mevaluation warning:[0m ${msg}" v
);
# Same thing as flatten.
mapAttrsToList = f: attrs:
builtins.map (name: f name attrs.${name}) (builtins.attrNames attrs);
# Module files for a single shard
# Type: String -> String -> ListOf Path
namesForShard = shard: type:
if type != "directory"
then warn "Ignored non-directory, whilst importing by-name modules: '${shard}'" []
else let
mkPath = name: _type: let
path = baseDirectory + "/${shard}/${name}/module.nix";
in
if builtins.pathExists path
then path
else warn "'${builtins.toString path}' does not exist. Skipped" null;
in
flatten
(builtins.filter (it: it != null)
(mapAttrsToList
mkPath
(builtins.readDir (baseDirectory + "/${shard}"))));
# A list of all module paths.
# These can the be simply injected into `import`
moduleFiles = flatten (mapAttrsToList namesForShard (builtins.readDir baseDirectory));
in
moduleFiles
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